Add comparison page

[davelab6]

@impallari will you accept a PR that adds a comparison page similar to http://sf-playground.github.io/hackover/ ? :)

[davelab6]

So, you won't accept such a PR if someone else does it?

[impallari]

Yes, I will, but it has to be done in a way that it's somewhat simple and encapsulated, so it don't mess around with the rest of the page

[davelab6]

Sure! Please re-open :)